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Mechanisms and modelling of phosphorus solid–liquid transformation during the hydrothermal processing of swine manure
Green Chemistry ( IF 9.3 ) Pub Date : 2020-06-19 , DOI: 10.1039/d0gc01281e Yaxin Deng 1, 2, 3, 4, 5 , Tao Zhang 1, 2, 3, 4, 5 , James Clark 6, 7, 8, 9 , Tejraj Aminabhavi 10, 11, 12 , Andrea Kruse 13, 14, 15, 16 , Daniel C. W. Tsang 17, 18, 19, 20 , Brajendra K. Sharma 21, 22, 23, 24, 25 , Fusuo Zhang 1, 2, 3, 4, 5 , Hongqiang Ren 20, 26, 27, 28, 29
Green Chemistry ( IF 9.3 ) Pub Date : 2020-06-19 , DOI: 10.1039/d0gc01281e Yaxin Deng 1, 2, 3, 4, 5 , Tao Zhang 1, 2, 3, 4, 5 , James Clark 6, 7, 8, 9 , Tejraj Aminabhavi 10, 11, 12 , Andrea Kruse 13, 14, 15, 16 , Daniel C. W. Tsang 17, 18, 19, 20 , Brajendra K. Sharma 21, 22, 23, 24, 25 , Fusuo Zhang 1, 2, 3, 4, 5 , Hongqiang Ren 20, 26, 27, 28, 29
Affiliation
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Phosphorus (P) recovery from swine manure by hydrothermal processes has recently attracted considerable interest; however, research has been limited by knowledge gaps and challenges in understanding the mechanisms of soluble and insoluble P transformations and the evaluation of the effects of the reaction conditions. In this study, the transformation mechanisms were investigated and the soluble and insoluble phosphorus distributions in swine manure during the hydrothermal processes were modelled. By increasing the severity of the exogenous conditions, P transformed from insoluble to soluble, and then polymerized with the formation of orthophosphates; meanwhile, the formation of hydrochar was enhanced thereby facilitating further P reclamation. The effects of the endogenous conditions showed there may be a threshold of calcium content, which limited the combination of Ca and P. Calcium ions mainly reacted with P in the form of hydroxyapatite and octacalcium phosphate. The modelling and prediction results showed that a coalification model gives a good fit (RSP2 = 0.9205 and RIP2 = 0.8559) for changes in the concentrations of solid total P and liquid inorganic P. The prediction level of mean absolute error was good as well (MAESP = 0.74 mg g−1 and MAEIP = 0.62 mg g−1). These findings provide a range of scientific opportunities for achieving a comprehensive understanding of the basis of sustainable utilisation of P.
中文翻译：
猪粪水热过程中磷固液转化的机理与模型
通过水热法从猪粪中回收磷（P）引起了人们的极大兴趣。然而，由于在理解可溶和不可溶P转化的机理以及对反应条件的影响进行评估方面的知识空白和挑战，研究受到了限制。在这项研究中，研究了转化机理，并模拟了水热过程中猪粪中可溶性磷和不溶性磷的分布。通过增加外源条件的严重性，P从不溶性转变为可溶性，然后聚合形成正磷酸盐。同时，增加了水炭的形成，从而促进了进一步的磷回收。内源条件的影响表明钙含量可能存在阈值，这限制了Ca和P的结合。钙离子主要与P以羟基磷灰石和磷酸八钙的形式反应。建模和预测结果表明，煤化模型具有良好的拟合度（对于固体总P和液体无机P的浓度变化，R SP 2 = 0.9205，R IP 2 = 0.8559。平均绝对误差的预测水平也很好（MAE SP = 0.74 mg g -1，MAE IP = 0.62mg g -1）。这些发现为广泛理解磷的可持续利用基础提供了一系列科学机会。
更新日期：2020-06-19
中文翻译：
猪粪水热过程中磷固液转化的机理与模型
通过水热法从猪粪中回收磷（P）引起了人们的极大兴趣。然而，由于在理解可溶和不可溶P转化的机理以及对反应条件的影响进行评估方面的知识空白和挑战，研究受到了限制。在这项研究中，研究了转化机理，并模拟了水热过程中猪粪中可溶性磷和不溶性磷的分布。通过增加外源条件的严重性，P从不溶性转变为可溶性，然后聚合形成正磷酸盐。同时，增加了水炭的形成，从而促进了进一步的磷回收。内源条件的影响表明钙含量可能存在阈值，这限制了Ca和P的结合。钙离子主要与P以羟基磷灰石和磷酸八钙的形式反应。建模和预测结果表明，煤化模型具有良好的拟合度（对于固体总P和液体无机P的浓度变化，R SP 2 = 0.9205，R IP 2 = 0.8559。平均绝对误差的预测水平也很好（MAE SP = 0.74 mg g -1，MAE IP = 0.62mg g -1）。这些发现为广泛理解磷的可持续利用基础提供了一系列科学机会。
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